Improvement in cotton-gin ribs



UNITED STATES PATENT FFICE.

JOSEPH C. DU BOIS, OF GREENSBOROUGH, ALABAMA.

IMPROVEMENT IN COTTON-GIN RIBS.

Specilication forming part of Letters Patent No. 157,743, dated December15,1874 application led September 9, 1874.

To allv whom it may concern:

Be it known that I, JOSEPH C. DU BOIS, of Greensborough, in the countyof Hale and State of Alabama, have invented a new and useful Improvementin Cotton-Gin Ribs; and I hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawing making a part of this specification, in which-Figure l is a view in perspective of the cotton-gin rib with myimprovement. Fig. 2 is a view in perspective of the chilling-block; andFig. 3 is a transverse sectional view of Fig. 1, taken through the linex x.

Cotton-gin ribs have been heretofore chilled on the face only. When aange has been used it has been cast on the face of the rib, except atthe point where the cotton is driven against the rib by the teeth of thesaw. The point last mentioned, an inch or more in length, has been leftplain and chilled on the face in casting, and the flange at this pointhas been supplied by riveting to the face of the rib a piece of brass ofappropriate size, and corresponding in shape to the flange cast on therib. Both of these methods are ineffectual and expensive ineffectualbecause the edges of the rib, where it is most likely to be worn, arenot chilled, and expensive because several operations have necessarilyto be performed to complete the rib.

My invention relates to an improvement in the class of cotton-gin ribsabove mentioned; and it consists of a cotton-gin rib having its face,lian ge, and edges chilled at the point where the saws drive the cottonagainst the rib, the object being to prevent the rib from being worn atthe edges, as will hereafter more fully appear.

In the accompanying drawing, A is a cotton-gin rib provided with aflange, B. O is a chilling-block of iron, provided with a recess, D, ofa shape to receive the rib A and iiange B at the point E, and leave therear face of the rib Ain the same plane with the rear face of thechilling-block O.

To cast the rib A, the pattern and chillingblock C are placed in thesand in the flask, and when the impression is taken the pattern iswithdrawn, but the iron chilling-block C is left in the ask. When themolten iron is poured into the ask it comes in contact with the ironchilling-block O, and is suddenly cooled, thereby chilling the face,flange, and edges of the rib A at the point E.

By this operation an improved rib is produced, which will not be worn atthe edges byl having the cotton driven against it, as would be the casewere the edges not chilled, as has heretofore been the case.

Having thus described my invention, what I claim as new and useful, anddesire to secure by Letters Patent, is

As a new article of manufacture, a cottongin rib having its face,flange, and edges chilled at the point where the cotton is drivenagainst it by the saws, as hereiubefore set forth.

In testimony that I claim the foregoing improvement, as above described,I have hereunto set my hand and seal this 5th day of September, 1874.

JOSEPH O. DU BOIS. [L. s]

Witnesses:

E. A. REEsE, J. W. HILDEBRAND.

